That's the track that heads to and over the Susquehanna river bridge of the old Bloomsburg branch of the DL&W.The Luzerne Susquehanna shop is a few blocks to the south via the left track, and they normally store engines in this area.

Whatever it was doing at Pittston, looking at the recent Topton photo, it sure wasn't to get it cosmetically restored at the L&S shops!EDIT: Is that red buildng with the white doors in both of Frank's pictures the L&S Shop?